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In most cases, UDMA mode on hard drive will only activate when the drive is installed in a system with full UDMA capability, i.e., a mother board or interface card with the UDMA chips and the associated UDMA software drivers, hard drives are Ultra DMA 66 (UDMA Mode 4) compatible. For UDMA 66/100 data transfer rate, a UDMA 80-conductor cable is required.
